Re: [PATCH iwl-net] idpf: decrease statistics refresh interval

[Danny Gonzalez]

On Thu, Jun 11, 2026 at 8:57 AM Alexander Lobakin
<aleksander.lobakin@xxxxxxxxx> wrote:
>
> From: Danny Gonzalez <digonzal@xxxxxxxxxx>
> Date: Thu, 11 Jun 2026 00:24:37 +0000
>
> > The default 10s statistics refresh interval is too slow for real-time
> > monitoring and causes network selftests (e.g., uso.py) to fail when
> > verifying traffic immediately after transmission.
> >
> > A 10s delay also causes aliasing in telemetry tools polling at shorter
> > intervals (e.g., 5s), leading to inaccurate rate calculations on
> > high-throughput NICs.
> >
> > Decrease the refresh interval to 250ms to ensure fresh stats and fix
> > test failures.
>
> Have you tried a bit more conservate value like 1s? Wouldn't it be
> enough for tests to pass?
>
> 250 ms is also okay, just curious.

Yes, 1s also allows the tests to pass.

We have a preference for 250 ms since High-Freq Telemetry (1s poll)
1s driver refresh rate causes aliasing:

# sar -n DEV 1 | grep eth1
10:52:15         eth1    390.00    339.00     51.92     55.54
0.00      0.00      0.00      0.00
10:52:16         eth1    409.00    360.00     54.72     58.64
0.00      0.00      0.00      0.00
10:52:17         eth1      0.00      0.00      0.00      0.00
0.00      0.00      0.00      0.00

Thanks,
Danny


>
> >
> > Tested: drivers/net/hw:uso.py now passes
> > Fixes: a251eee62133 ("idpf: add SRIOV support and other ndo_ops")
> > Signed-off-by: Danny Gonzalez <digonzal@xxxxxxxxxx>
>
> Thanks,
> Olek